I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
knelt kneeled knelled knolled nullity nielloed
knelt melty shelta felt helot gelt kelt melt belt relet pelt relit celt dealt delt delta welt shelty
knell kneel knoll knolly nellie nelly newly nielli niello noel anele snell